SYSTEM.SPACEDEFAULT contains the default 
TABLESPACE and SECTIONSPACE DBEFileSets for PUBLIC.
Initially SYSTEM.SPACEDEFAULT contains two rows, one having the column values
PUBLIC, SYSTEM, 1 and the other having the column values PUBLIC, SYSTEM, 2.  
Thus SYSTEM is the default DBEFileSet for table, long column, and
section data for PUBLIC.
ALLBASE/SQL accesses SYSTEM.SPACEDEFAULT whenever a table, long column,
rule, check constraint, procedure, or section
(generated by a PREPARE, DECLARE CURSOR, or CREATE VIEW statement)
is created without the IN DBEFileSetNAME clause.
Table 8-34 System.Spacedefault
| 
Column Name
 | 
Type
 | 
Length
 | 
Description | 
|---|
| 
USERID
 | 
CHAR
 | 
20
 | 
Authorized DBEUserID or
authorization group
 | 
| 
DBEFILESET
 | 
CHAR
 | 
20
 | 
Name of a DBEFileSet
 | 
| 
SPACETYPE
 | 
SMALLINT
 | 
2
 | Type of default DBEFileSet: 
   1 (SECTIONSPACE) 
   2 (TABLESPACE)
  | 
 
Example | 
  | 
   select * FROM System.Spacedefault;
   --------------------+--------------------+---------
   USERID              |DBEFILESET          |SPACETYPE
   --------------------+--------------------+---------
   PUBLIC              |SYSTEM              |        1
   PUBLIC              |SYSTEM              |        2
   --------------------------------------------------------------------------
   Number of rows selected is 2
   U[p], d[own], l[eft], r[ight], t[op], b[ottom], pr[int] <n>,or e[nd]> e
  |